WO2004038068A1 - Method for removing a layer area of a component - Google Patents
Method for removing a layer area of a component Download PDFInfo
- Publication number
- WO2004038068A1 WO2004038068A1 PCT/EP2003/009235 EP0309235W WO2004038068A1 WO 2004038068 A1 WO2004038068 A1 WO 2004038068A1 EP 0309235 W EP0309235 W EP 0309235W WO 2004038068 A1 WO2004038068 A1 WO 2004038068A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- component
- bath
- salt bath
- treated
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
- C23G1/32—Heavy metals
Definitions
- the invention relates to a method for removing a layer region of a component.
- the possibility of increasing the efficiency and thus reducing the operating costs is to increase the inlet temperatures of a combustion gas within a gas turbine.
- thermal barrier coatings have been developed that are applied to thermally stressed components, such as superalloys, that alone could no longer withstand the high inlet temperatures in the long run.
- the ceramic thermal barrier coating offers the advantage of high temperature resistance due to its ceramic properties and the metallic substrate the advantage of the good mechanical properties in this composite or layer system.
- an adhesion-promoting layer with the composition MCrAlY (main components) is applied between the substrate in the ceramic thermal barrier coating, where M means that a metal from the group consisting of nickel, chromium or iron is used.
- composition of these MCrAlY layers can vary, however, all MCrAlY layers are subject to corrosion by oxidation, sulfite dation or other chemical and / or mechanical attacks.
- the MCrAlY layer often degrades to a greater extent than the metallic substrate (e.g. Ni, Co based
- the MCrAlY layer is only partially functional after a long period of use, however, the substrate can still be fully functional.
- EP 759 098 B1 shows a method for cleaning turbine airfoils, in which potassium hydroxide is used. It is also prior art to remove corroded layers by acid stripping, as is known from US Pat. No. 5,944,909.
- the object is achieved by a method according to claim 1, in which the component is treated in a salt bath before an acid treatment.
- FIG. 1 shows a component
- FIG. 2 shows a layer system
- Figure 4 is a component treated with the inventive method.
- FIG. 1 shows a component 1 which is to be treated with the method according to the invention.
- the surface area 10 consists, for example, of an oxide that was formed at high temperatures. Areas not degraded can also be removed by the method according to the invention.
- FIG. 2 shows a further component 1 that can be treated with the method according to the invention.
- the component 1 consists of a substrate 4 (e.g. nickel, cobalt-based superalloy) and a layer 7 (e.g. MCrAlY) which is degraded and is to be removed using the method according to the invention.
- a substrate 4 e.g. nickel, cobalt-based superalloy
- a layer 7 e.g. MCrAlY
- the substrate 4 can also be degraded, the degraded regions of the substrate 4 then also being removed, for example.
- rough mechanical pre-cleaning e.g. Sandblasting or flow grinding a first removal of the layer regions 7, 10 to be removed and / or also a ceramic thermal insulation layer which is arranged above the layer 7 takes place.
- the treatment with sandblasting and / or flow grinding can also take place between or after the individual salt and acid treatments or at the end.
- the component 1, in particular the layer regions 7, 10 to be removed, is then treated in a liquid salt bath (melt) into which at least the regions 7, 10 of the component 1 are immersed.
- salts is understood to mean, for example, compounds of metal (metal ion) and acid residue (acid less than a hydrogen ion), for example NaHC0 3 , Na 2 C0 3 , CaC0 3 .. and / or base residue.
- the salt bath consists, for example, of sodium hydroxide (NaOH) or potassium hydroxide (KOH) (e.g. a molten bath, i.e. liquid at temperatures higher than room temperature). Both salts can also be used together and then in particular have a mixing ratio of 50 to 50 percent by volume. Further salt baths are conceivable.
- NaOH sodium hydroxide
- KOH potassium hydroxide
- sodium oxide (Na0 2 ) above salts can also be added, for example, as an oxygen supplier, which increases the chemical attack on the areas to be removed.
- oxygen suppliers are conceivable, such as an oxygen supply, oxides or metal oxides.
- Treatments of component 1 in different salt baths can also be carried out in succession.
- washing and / or drying takes place.
- the temperature differences between the salt bath and the washing medium are used for a thermal shock, which mechanically weakens the layer area to be removed due to crack formation.
- an acid treatment is carried out in an at least first acid bath, which consists of an acid or an acid mixture.
- an acid treatment is carried out, for example, with nitric acid HN0 3 and / or phosphoric acid H 3 P0 4 .
- Other acids eg sulfuric acid, sulfurous, sapletous acid, carbonic acid, hydrofluoric acid, ...) and / or acid mixtures are conceivable and are tailored to the respective salt bath.
- treatment with hydrochloric acid HC1 as a second acid bath is carried out at least once.
- the individual treatment steps in which the component comes into contact with the salt bath or the various acids, as well as the washing and drying, can each be repeated several times.
- FIG. 3 shows a device 22 with which the method according to the invention can be carried out.
- the device 22 consists of a container 19 in which a liquid salt or salt mixture or an acid is present.
- the component 1 is immersed in this liquid.
- the method can be shortened or improved if an ultrasound probe 16 is present in the bath 13 and is operated.
- FIG. 4 shows a component 1 which has been treated by the method according to the invention. Component 1 no longer has any corroded areas. Exemplary treatment sequences are listed below:
- Flow grinding (see also DE 199 02 422A1) is particularly suitable for components 1, in particular for blades of turbines, with interior spaces in which degraded areas are present in the interior.
- outside areas are preferably sandblasted, using, for example, corundum.
- the maximum blasting pressure and the particle size of the blasting material must be set so as not to damage the substrate.
- a salt from Degussa which is marketed under the trade name DUFERRIT RS DGS, is preferably used for the salt bath.
- Oxides of the component that are exposed to the salt bath are transformed into more oxide-rich compounds that are more acid-soluble.
- the coefficients of expansion of oxides and metals are generally differently. Moving the components 1 from a warm salt bath into a quenching water bath causes a thermal shock, which creates cracks in the area (7, 11) to be removed and weakens it mechanically, for example by increasing the attack surfaces for salt and / or acid. This thermal shock is used as an additional effect when cleaning.
- Diammonium EDTA is used as the complexing agent.
- the complexing agent can bind metals, thereby removing them.
- the treatment with the complexing agent can take place between, before or after the individual salt and acid treatments.
- an ultrasound probe 16 can also be used in the bath 13 with the complexing agent in order to accelerate the process.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004545756A JP2006503186A (en) | 2002-10-18 | 2003-08-20 | How to remove the layer range of parts |
US10/531,219 US20060231123A1 (en) | 2002-10-18 | 2003-08-20 | Method for removing a layer area of a component |
EP03809256A EP1552037B1 (en) | 2002-10-18 | 2003-08-20 | Method for removing a layer area of a component |
DE50305651T DE50305651D1 (en) | 2002-10-18 | 2003-08-20 | METHOD FOR REMOVING A LAYER OF A COMPONENT |
US11/502,487 US20070131255A1 (en) | 2002-10-18 | 2006-08-10 | Method for removing a layer area of a component |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02023394.6 | 2002-10-18 | ||
EP02023394A EP1411149A1 (en) | 2002-10-18 | 2002-10-18 | Process for stripping coatings from components |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/502,487 Continuation-In-Part US20070131255A1 (en) | 2002-10-18 | 2006-08-10 | Method for removing a layer area of a component |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004038068A1 true WO2004038068A1 (en) | 2004-05-06 |
Family
ID=32039155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/009235 WO2004038068A1 (en) | 2002-10-18 | 2003-08-20 | Method for removing a layer area of a component |
Country Status (7)
Country | Link |
---|---|
US (2) | US20060231123A1 (en) |
EP (3) | EP1411149A1 (en) |
JP (1) | JP2006503186A (en) |
CN (1) | CN100392152C (en) |
DE (1) | DE50305651D1 (en) |
ES (2) | ES2372406T3 (en) |
WO (1) | WO2004038068A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008523291A (en) * | 2004-12-11 | 2008-07-03 | エムテーウー・アエロ・エンジンズ・ゲーエムベーハー | Turbine blade repair method |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1559485A1 (en) * | 2004-01-30 | 2005-08-03 | Siemens Aktiengesellschaft | Method for removing a layer |
JP4848504B2 (en) * | 2007-03-14 | 2011-12-28 | 公益財団法人新産業創造研究機構 | Method for cleaning ceramic substrate or inorganic heat resistant substrate, device manufacturing method using the same, and device |
TWI479559B (en) * | 2007-06-28 | 2015-04-01 | Quantum Global Tech Llc | Methods and apparatus for cleaning deposition chamber parts using selective spray etch |
DE102008005168A1 (en) * | 2008-01-19 | 2009-07-23 | Mtu Aero Engines Gmbh | A method of at least selectively removing a first layer of an engine component |
US7875200B2 (en) | 2008-05-20 | 2011-01-25 | United Technologies Corporation | Method for a repair process |
FR2970197B1 (en) * | 2011-01-11 | 2013-12-20 | Snecma | METHOD FOR DEOLIDARIZING / SOLIDARIZING BY INDUCING A MAGNETIC MECHANICAL PIECE FIXED WITH A MECHANICAL PART |
DE102011051696B3 (en) * | 2011-07-08 | 2012-08-02 | Deutsche Edelstahlwerke Gmbh | Method for measuring the layer thickness of organic coatings of metallic base materials |
US9103037B2 (en) * | 2011-09-01 | 2015-08-11 | United Technologies Corporation | Method for stripping gamma-gamma prime coating from gamma-gamma prime alloy |
JP5881513B2 (en) * | 2012-04-06 | 2016-03-09 | 三菱重工業株式会社 | Method for removing coating from gas turbine member |
CN103042006B (en) * | 2013-01-18 | 2016-01-20 | 山东大学 | ultrasonic salt bath composite cleaning machine |
ES2655241T3 (en) * | 2013-03-01 | 2018-02-19 | General Electric Company | Corrosion inhibition procedures in gas turbine air compressors |
CN103464419A (en) * | 2013-09-24 | 2013-12-25 | 山东大学 | Novel ultrasonic salt bath composite cleaning machine |
CN104690033A (en) * | 2015-03-17 | 2015-06-10 | 山东大学 | Ultrasonic salt bath combined cleaning machine for mechanical parts for test |
CN105586603B (en) * | 2015-11-23 | 2018-10-09 | 佛山市高明俊品金属制品有限公司 | A kind of stainless steel oxidation skin minimizing technology |
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US2710271A (en) * | 1951-08-09 | 1955-06-07 | Int Nickel Co | Process for annealing and cleaning oxidized metal in a salt bath |
JPS61199085A (en) * | 1985-02-28 | 1986-09-03 | Miyata Kogyo Kk | Manufacture of precision casting |
US5575858A (en) * | 1994-05-02 | 1996-11-19 | United Technologies Corporation | Effective cleaning method for turbine airfoils |
US5944909A (en) * | 1998-02-02 | 1999-08-31 | General Electric Company | Method for chemically stripping a cobalt-base substrate |
US6132520A (en) * | 1998-07-30 | 2000-10-17 | Howmet Research Corporation | Removal of thermal barrier coatings |
EP1213370A2 (en) * | 2000-12-05 | 2002-06-12 | General Electric Company | Method and composition for cleaning a turbine engine component |
US20020074017A1 (en) * | 2000-12-19 | 2002-06-20 | Schilbe John E. | Cleaning of internal passages of airfoils |
Family Cites Families (20)
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US575858A (en) * | 1897-01-26 | One one-hundredths to william rapp | ||
US2138357A (en) * | 1936-04-24 | 1938-11-29 | Solvay Process Co | Dialysis of aqueous caustic solutions |
US2738293A (en) * | 1952-07-25 | 1956-03-13 | Diamond Alkali Co | Salt bath system and method for treating metals |
US2792283A (en) * | 1953-01-28 | 1957-05-14 | Diamond Alkali Co | Process of making sodium bicarbonate from sodium hydroxide cell liquor |
US2837443A (en) * | 1954-07-26 | 1958-06-03 | Eagle Picher Co | Method of porcelain enameling |
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US3000829A (en) * | 1958-06-12 | 1961-09-19 | Purex Corp Ltd | Composition and process for descaling metal parts |
US3015589A (en) * | 1959-07-16 | 1962-01-02 | Diamond Alkali Co | Chemical method |
AT293139B (en) * | 1967-02-16 | 1971-09-27 | Degussa | Process for descaling metals |
US3532591A (en) * | 1967-11-28 | 1970-10-06 | Gen Electric | Etching silicide coatings and article formed therefrom |
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US6902628B2 (en) * | 2002-11-25 | 2005-06-07 | Applied Materials, Inc. | Method of cleaning a coated process chamber component |
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-
2002
- 2002-10-18 EP EP02023394A patent/EP1411149A1/en not_active Withdrawn
-
2003
- 2003-08-20 ES ES06020613T patent/ES2372406T3/en not_active Expired - Lifetime
- 2003-08-20 DE DE50305651T patent/DE50305651D1/en not_active Expired - Lifetime
- 2003-08-20 ES ES03809256T patent/ES2275138T3/en not_active Expired - Lifetime
- 2003-08-20 CN CNB038238357A patent/CN100392152C/en not_active Expired - Fee Related
- 2003-08-20 EP EP06020613A patent/EP1752562B1/en not_active Expired - Lifetime
- 2003-08-20 JP JP2004545756A patent/JP2006503186A/en active Pending
- 2003-08-20 WO PCT/EP2003/009235 patent/WO2004038068A1/en active IP Right Grant
- 2003-08-20 US US10/531,219 patent/US20060231123A1/en not_active Abandoned
- 2003-08-20 EP EP03809256A patent/EP1552037B1/en not_active Expired - Lifetime
-
2006
- 2006-08-10 US US11/502,487 patent/US20070131255A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2710271A (en) * | 1951-08-09 | 1955-06-07 | Int Nickel Co | Process for annealing and cleaning oxidized metal in a salt bath |
JPS61199085A (en) * | 1985-02-28 | 1986-09-03 | Miyata Kogyo Kk | Manufacture of precision casting |
US5575858A (en) * | 1994-05-02 | 1996-11-19 | United Technologies Corporation | Effective cleaning method for turbine airfoils |
US5944909A (en) * | 1998-02-02 | 1999-08-31 | General Electric Company | Method for chemically stripping a cobalt-base substrate |
US6132520A (en) * | 1998-07-30 | 2000-10-17 | Howmet Research Corporation | Removal of thermal barrier coatings |
EP1213370A2 (en) * | 2000-12-05 | 2002-06-12 | General Electric Company | Method and composition for cleaning a turbine engine component |
US20020074017A1 (en) * | 2000-12-19 | 2002-06-20 | Schilbe John E. | Cleaning of internal passages of airfoils |
Non-Patent Citations (1)
Title |
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DATABASE WPI Section Ch Week 198642, Derwent World Patents Index; Class M14, AN 1986-274660, XP002228489 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008523291A (en) * | 2004-12-11 | 2008-07-03 | エムテーウー・アエロ・エンジンズ・ゲーエムベーハー | Turbine blade repair method |
Also Published As
Publication number | Publication date |
---|---|
EP1752562B1 (en) | 2011-10-05 |
ES2275138T3 (en) | 2007-06-01 |
CN100392152C (en) | 2008-06-04 |
US20060231123A1 (en) | 2006-10-19 |
CN1688749A (en) | 2005-10-26 |
DE50305651D1 (en) | 2006-12-21 |
ES2372406T3 (en) | 2012-01-19 |
JP2006503186A (en) | 2006-01-26 |
EP1552037A1 (en) | 2005-07-13 |
EP1752562A1 (en) | 2007-02-14 |
EP1411149A1 (en) | 2004-04-21 |
EP1552037B1 (en) | 2006-11-08 |
US20070131255A1 (en) | 2007-06-14 |
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